Endogenous endotoxemia of intestinal origin during cardiopulmonary bypass. Role of type of flow and protective effect of selective digestive decontamination.
OBJECTIVE
To evaluate the possible related factors to endotoxemia and cytokine activation during the ischemic phase of extracorporeal surgery, and the effect of selective digestive decontamination (SDD) as a preventive measure.


METHODS
Prospective, open, randomized trial.


METHODS
Two multidisciplinary ICUs (tertiary care hospitals).


METHODS
One hundred consecutive patients undergoing cardiopulmonary bypass (CPB), randomly allocated to two groups; gut decontamination (group I = 50 cases) and controls (group II = 50 cases).


METHODS
Preoperative administration of oral non-absorbable antibiotics (polymyxin E, tobramycin and amphotericin B) versus no administration.


RESULTS
The assessment of decontamination by means of the bacteriologic control of rectal swabs. Determinations of gastric intramucosal pH (gastric pHi) and plasma endotoxin, tumor necrosis factor (TNF) aNd interleukin-6 (IL-6) before surgery and during the ischemic and reperfusion phases of bypass. Rectal aerobic Gram-negative bacilli (AGNB) were significantly reduced in the treated patients and in 56% total eradication was achieved. Endotoxin, TNF and IL-6 plasma levels were significantly lower in this group. By contrast, both endotoxin and TNF/IL-6 levels and gastric pHi correlated with the type of surgical flow (pulsatile versus non-pulsatile).


CONCLUSIONS
SDD reduces the gut content of enterobacteria. This may explain the lower endotoxin and cytokine levels detected in decontaminated patients. In addition to SDD, the type of flow employed during bypass seems to influence endotoxemia and cytokine levels.
Martinez-Pellús
A E
AE
Intensive Care Unit, Hospital Universitario Virgen del la Arrixaca, El Palmar Murcia, Spain.
Merino
P
P
Bru
M
M
Canovas
J
J
Seller
G
G
Sapiña
J
J
Fuentes
T
T
Moro
J
J
D000666:Amphotericin B / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D019072:Antibiotic Prophylaxis; D002315:Cardiopulmonary Bypass / Q000009:adverse effects*; D003091:Colistin / Q000627:therapeutic use; D016207:Cytokines / Q000097:blood; D019446:Endotoxemia / Q000209:etiology* / Q000382:microbiology / Q000517:prevention & control*; D004755:Enterobacteriaceae; D005260:Female; D006801:Humans; D007410:Intestinal Diseases / Q000150:complications* / Q000188:drug therapy / Q000382:microbiology; D007422:Intestines / Q000098:blood supply; D007511:Ischemia / Q000209:etiology / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013514:Surgical Procedures, Operative / Q000009:adverse effects*; D014031:Tobramycin / Q000627:therapeutic use
D000900:Anti-Bacterial Agents; D016207:Cytokines; D000666:Amphotericin B; D014031:Tobramycin; D003091:Colistin